摘要
以γ-Al_2O_3为载体,Ni(NO_3)_2和Ce(NO_3)_3为浸渍液,以不同顺序添加浸渍液制备一组负载型催化剂,采用比表面积分析(BET)、X射线衍射(XRD)、H_2程序升温还原(H2-TPR)等表征手段分析不同浸渍顺序对催化剂结构和性质的影响,并采用固定床反应器考察了催化剂对粗己内酰胺加氢精制反应的影响。结果表明:采用分步浸渍法,载体γ-Al_2O_3依次浸渍在Ce(NO_3)_3和Ni(NO_3)_2溶液中制备的NiO/CeO_2/γ-Al_2O_3催化剂具有较好的催化活性和稳定性,在温度90℃,压力0.8 MPa,空速0.8 h-1,氢液比75的反应条件下,其粗己内酰胺加氢精制产物高锰酸钾值(PM值)能够稳定在22 000 s。
Using nickel nitrate and cerium nitrate as impregnation liquids and γ-Al2O3 as supporter, a seriesof supported catalysts were prepared with different adding order of impregnation liquids. The effects ofdifferent impregnation sequence on the structure and properties of catalysts were characterized by specificsurface area(BET) analysis, X-ray diffraction(XRD) and hydrogen temperature-programmed reduction(H2-TPR). The catalytic performance of various catalysts for the crude caprolactam purification wasinvestigated in a fixed bed reactor. It was found that the NiO/CeO2/γ-Al2O3 catalyst prepared by fractionalimpregnation using Ce(NO3)3, Ni(NO3)2 sequentially impregnated supported on γ-Al2O3 had a bettercatalytic performance and stability. Under the reaction conditions of temperature 90 ℃, pressure 0.8 MPa,liquid hourly space velocity(LHSV) 0.8 h-1 and volume of H2 to liquid 75, the permanganate number(PMnumber) of the crude caprolactam purification over NiO/CeO2/γ-Al2O3 catalyst could be stable at 22 000 s.
作者
刘森
王重庆
陈晓蓉
梅华
Liu Sen;Wang Chongqing;Chen Xiaorong;Mei Hua(College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;Catalytic Hydrogenation Engineering Technology Research Center, Nuomeng Chem, Nanjing 210009, China)
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2016年第2期158-163,共6页
Chemical Reaction Engineering and Technology
关键词
浸渍顺序
氧化镍
二氧化铈
负载型催化剂
己内酰胺
高锰酸钾值
impregnation sequence
nickel monoxide
cerium oxide
supported catalyst
caprolactam
permanganate number
